chemistry / Physical Chemistry / free

Solutions & Concentration

Dilute a solution and see the same particles spread through more volume.

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Solute amount is chosen. Moles count how much solute is present; adding or removing solute changes the numerator of the ratio.

moles ÷ volume0.40 M after dilution

Focus the idea

initial molarity1.00 M

final molarity0.40 M

dilution factor2.5×

particles200

Solute amount 2 molInitial volume 2 LFinal volume 5 L

The moles stay fixed while volume changes, so molarity falls from 1.00 M to 0.40 M.

Molarity is a ratio, not a count. Dilution adds solvent, so the same solute occupies more volume without creating or destroying solute particles.

04 / PRACTICE

Make the chemistry yours.

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Answer from the model, then use the explanation to connect the particle picture to the chemical rule.

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